Simultaneous Cr(VI) reduction and electricity generation in Plant-Sediment Microbial Fuel Cells (P-SMFCs): Synthesis of non-bonding Co3O4 nanowires onto cathodes

被引：28

作者：

Cheng, Ce ^{[1
,2
]}

Hu, Yongyou ^{[1
,2
]}

Shao, Sicheng ^{[1
,2
]}

Yu, Jiayuan ^{[1
,2
]}

Zhou, Weijia ^{[1
,2
]}

Cheng, Jianhua ^{[1
,2
]}

Chen, Yuancai ^{[1
,2
]}

Chen, Shengnan ^{[1
,2
]}

Chen, Junfeng ^{[1
,2
]}

Zhang, Lihua ^{[1
,2
]}

机构：

[1] South China Univ Technol, Guangzhou Higher Educ Mega Ctr, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China

[2] South China Univ Technol, Guangzhou Higher Educ Mega Ctr, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Minist Educ, Guangzhou 510006, Guangdong, Peoples R China

来源：

ENVIRONMENTAL POLLUTION | 2019年 / 247卷

基金：

中国国家自然科学基金;

关键词：

Plant-Sediment Microbial Fuel Cells (P-SMFCs); Electricity generation; Cr(VI); Power density; Oxygen vacancies; HEXAVALENT CHROMIUM; REMOVAL; WATER; IMMOBILIZATION; ADSORPTION; BINDERS; CARBON;

D O I：

10.1016/j.envpol.2019.01.084

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Development of low-cost cathode materials for Plant-Sediment Microbial Fuel Cells (P-SMFCs) has gained increasing interest, due to improved performance levels in terms of power and pollutant removal. A novel low cost three-dimensional cathode prepared by simple three-step strategy with growth of Co3O4 in-situ biofilm was successfully prepared. Different cathodes were applied to the six parallel P-SMFCs systems (reactor: R1-R6), such as graphite felt (GF), Pt/C, GF@Co3O4 (non-bonding Co3O4 nano wires on GF), GF@SG-Co3O4 (using argon as shielding gas (SG)). Its performances (RI, R2: control groups) were evaluated by electricity generation and Cr(VI) reduction at initial cadmium concentrations (4.97, 10.29 and 21.16 mg L-1). A significant Cr(VI) removal efficiency of 99.76%, maximum power density of 75.12 +/- 2.90 mW m(-2) and Cr(VI) adsorption capacity of 1.67 mg g(-1) were obtained at initial Cr(VI) concentration of 21.16 mg L-1 with non-bonding GF@Co3O4 and bio-GF@SG-Co3O4 as cathodes. This indicated that these two materials were better than others (GF, Pt/C and GF@Co3O4) as cathodes. Characterization analysis including scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Polarization curve, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) showed that high current generation Cr(VI) removal mainly attributed to transportation of plants, adsorption of bio-cathode, formation of a relatively high concentration region and abundant oxygen vacancies of GF@SG-Co3O4. The results show that P-SMFCs with GF@SG-Co3O4 cathode may be a potentially novel approach for remediating Cr(VI) contaminated waster or soil. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：647 / 657

页数：11